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Sagot :
The required probability for
a. 0.2058
b. 0.98
c.0.016
What is probability?
Probability can be defined as the ration of favorable outcomes to the total number of events.
Let use binomial distribution.
Probability answering a question correctly=1/3 =0.33
Probability of not answering a question correctly
=1–1/3
=2/3
a) Out of 10 probability of answering 4 correctly
=10c4 x (0.33)^4 x (0.66)^6
Upon simplification, 0.2058
b) Find the probability for getting at least 2 correct answers
= 1 - { 10c8 x (0.33)^8 x (0.66)^2+ 10c9 x (0.33)^9 x (0.66)^1 + (0.33)^10}
= 0.98
c).Find the probability for getting 2 or 3 incorrect answers.
10c8 x (0.33)^8 x (0.66)^2 + 10c7 x (0.33)^7 X (0.66)^3
=0.002 + 0.014
= 0.016
Thus the required probabilities are: 0.2058, 0.98 , 0.016
Learn more about probability here:
brainly.com/question/14290572
#SPJ1
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